In the following situations a light is being directed towards youby the object d

Question

In the following situations a light is being directed towards youby the object described. In which of the following will there be aDoppler Effect? Choose all that apply.

1 A police car is stationary. You aremoving away from it while traveling 40mph.
A fire truck is moving away from youwhile traveling 50 mph. You are movingtowards it while traveling 50mph.
An ambulance is moving towards you whiletraveling 50 mph. You arestationary.
A train is circling you. You arestationary.
A flying saucer is moving away from youwhile traveling 50 ft/min. You are movingaway from it while traveling 40ft/min. 1

Explanation / Answer

   Dopplereffect is the change in frequency  of awave for an observer moving relative to the source of thewave. It is commonly heard when a vehicle sounding a siren orhorn approaches, passes, and recedes from an observer.

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